弄髒手 [－脏－]

Jyutping lung6 zong1 sau2
Pinyin nòng zàng shǒu

Definitions (Wiktionary)
  1. verb
    to do the dirty work
  2. verb
    Used other than figuratively or idiomatically: see 弄髒／弄脏 (nòngzāng), 手 (shǒu).